From owner-freebsd-current@FreeBSD.ORG  Sun Jul 18 21:01:44 2010
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Delivered-To: freebsd-current@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 3BF941065672
	for <freebsd-current@freebsd.org>; Sun, 18 Jul 2010 21:01:44 +0000 (UTC)
	(envelope-from dan@dan.emsphone.com)
Received: from email1.allantgroup.com (email1.emsphone.com [199.67.51.115])
	by mx1.freebsd.org (Postfix) with ESMTP id EE7628FC0C
	for <freebsd-current@freebsd.org>; Sun, 18 Jul 2010 21:01:43 +0000 (UTC)
Received: from dan.emsphone.com (dan.emsphone.com [199.67.51.101])
	by email1.allantgroup.com (8.14.0/8.14.0) with ESMTP id o6IL1h0i076753
	(version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO)
	for <freebsd-current@freebsd.org>; Sun, 18 Jul 2010 16:01:43 -0500 (CDT)
	(envelope-from dan@dan.emsphone.com)
Received: from dan.emsphone.com (smmsp@localhost [127.0.0.1])
	by dan.emsphone.com (8.14.4/8.14.4) with ESMTP id o6IL1gLR007899
	(version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO)
	for <freebsd-current@freebsd.org>; Sun, 18 Jul 2010 16:01:43 -0500 (CDT)
	(envelope-from dan@dan.emsphone.com)
Received: (from dan@localhost)
	by dan.emsphone.com (8.14.4/8.14.3/Submit) id o6IKra7t083330;
	Sun, 18 Jul 2010 15:53:37 -0500 (CDT) (envelope-from dan)
Date: Sun, 18 Jul 2010 15:53:36 -0500
From: Dan Nelson <dnelson@allantgroup.com>
To: Doug Barton <dougb@freebsd.org>
Message-ID: <20100718205336.GJ5485@dan.emsphone.com>
References: <alpine.BSF.2.00.1007171103060.1546@qbhto.arg>
	<F653FF83-D9CF-42A2-AE9A-B8F914090065@FreeBSD.org>
	<alpine.BSF.2.00.1007171208010.1538@qbhto.arg>
	<20100717192128.GM2381@deviant.kiev.zoral.com.ua>
	<alpine.BSF.2.00.1007180113370.1707@qbhto.arg>
	<20100718103003.GO2381@deviant.kiev.zoral.com.ua>
	<4C43541C.3060101@FreeBSD.org>
	<20100718194109.GU2381@deviant.kiev.zoral.com.ua>
	<4C435CBE.50500@FreeBSD.org>
	<20100718202338.GI5485@dan.emsphone.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20100718202338.GI5485@dan.emsphone.com>
X-OS: FreeBSD 8.1-PRERELEASE
User-Agent: Mutt/1.5.20 (2009-06-14)
X-Virus-Scanned: clamav-milter 0.96 at email1.allantgroup.com
X-Virus-Status: Clean
X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-2.0.2
	(email1.allantgroup.com [199.67.51.78]);
	Sun, 18 Jul 2010 16:01:43 -0500 (CDT)
X-Scanned-By: MIMEDefang 2.45
Cc: Kostik Belousov <kostikbel@gmail.com>, freebsd-current@freebsd.org,
	Rui Paulo <rpaulo@freebsd.org>
Subject: Re: Why is intr taking up so much cpu?
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
	<freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>, 
	<mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sun, 18 Jul 2010 21:01:44 -0000

In the last episode (Jul 18), Dan Nelson said:
> In the last episode (Jul 18), Doug Barton said:
> > On 07/18/10 12:41, Kostik Belousov wrote:
> > > When intr time starts accumulating again, try to do
> > > "procstat -kk <intr process pid>" and correlate the clock thread tid
> > > with the backtrace. Might be, it helps to guess what callouts are eating
> > > the CPU.
> > 
> > Will do, thanks!
> 
> You can also use dtrace to get a count of callouts and their time spent. 
> Run this for a few seconds then hit ^C:

That may actually be too verbose (you'll get a histogram per callout).  Try
the ones at http://wiki.freebsd.org/DTrace/Examples instead.

-- 
	Dan Nelson
	dnelson@allantgroup.com